I have limited hardware components I can use for this obstacle. Lets say I have precision rectified the input heartbeat signal into a square wave... I am trying to count the number of squarewaves/heartbeats and display them on two 7-segment displays refreshing every 15 seconds... I can only use a 4029 Up.dwn counter and a BCD driver to 7 segment display.... My issue is that the 4029 is going to need to refresh every 15 seconds however !!! the output needs to be in bpm (Beats per minute) which means it is off by a factor of 4... How can i multiply the output by 4 or is there a clever way i can do this with the timer that resets the 4029 every 15 seconds? PLEASE HELP. ive looked everywhere. even minute insight may prove valuable. thanks in advance.